<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .map {
      width: 747px;
      height: 617px;
      background-color: pink;
      margin: 0 auto;
      position: relative;
    }

    .city {
      position: absolute;
      top: 260px;
      right: 260px;
      /* background-color: red; */
    }

    .yuan {
      width: 8px;
      height: 8px;
      background-color: #09f;
      border-radius: 4px;
    }

    .city [class^="pulse"] {
      position: absolute;
      top: 50%;
      left: 50%;
      /* 保证我们小波纹在父盒子垂直居中，方法之后就会压住父盒子 */
      transform: translate(-50%, -50%);
      width: 8px;
      height: 8px;
      box-shadow: 0 0 12px #009dfd;
      border-radius: 50%;
      animation: donghua 1.2s linear infinite;
    }

    .city .pulse2 {
      animation-delay: 0.4s;

    }

    .city .pulse3 {
      animation-delay: 0.8s;

    }

    @keyframes donghua {
      0% {}

      70% {
        width: 40px;
        height: 40px;
        opacity: 1;

      }

      100% {
        width: 80px;
        height: 80px;
        opacity: 0;
      }
    }
  </style>
</head>

<body>
  <div class="map">
    <div class="city">
      <div class="yuan"></div>
      <div class="pulse1"></div>
      <div class="pulse2"></div>
      <div class="pulse3"></div>
    </div>
    <div class="city tb">
      <div class="yuan"></div>
      <div class="pulse1"></div>
      <div class="pulse2"></div>
      <div class="pulse3"></div>
    </div>


  </div>

</body>

</html>